P-660H/HW/W-T Series User’ Guide

Table 42 Predefined Services (continued)

SERVICE

DESCRIPTION

 

 

CU-SEEME(TCP/UDP:7648,

A popular videoconferencing solution from White Pines Software.

24032)

 

DNS(UDP/TCP:53)

Domain Name Server, a service that matches web names (e.g.

 

www.zyxel.com) to IP numbers.

FINGER(TCP:79)

Finger is a UNIX or Internet related command that can be used to find

 

out if a user is logged on.

FTP(TCP:20.21)

File Transfer Program, a program to enable fast transfer of files,

 

including large files that may not be possible by e-mail.

H.323(TCP:1720)

Net Meeting uses this protocol.

 

 

HTTP(TCP:80)

Hyper Text Transfer Protocol - a client/server protocol for the world

 

wide web.

HTTPS

HTTPS is a secured http session often used in e-commerce.

 

 

ICQ(UDP:4000)

This is a popular Internet chat program.

 

 

IPSEC_TRANSPORT/

The IPSEC AH (Authentication Header) tunneling protocol uses this

TUNNEL(AH:0)

service.

IPSEC_TUNNEL(ESP:0)

The IPSEC ESP (Encapsulation Security Protocol) tunneling protocol

 

uses this service.

IRC(TCP/UDP:6667)

This is another popular Internet chat program.

 

 

MSN Messenger(TCP:1863)

Microsoft Networks’ messenger service uses this protocol.

 

 

MULTICAST(IGMP:0)

Internet Group Multicast Protocol is used when sending packets to a

 

specific group of hosts.

NEWS(TCP:144)

A protocol for news groups.

 

 

NFS(UDP:2049)

Network File System - NFS is a client/server distributed file service that

 

provides transparent file-sharing for network environments.

NNTP(TCP:119)

Network News Transport Protocol is the delivery mechanism for the

 

USENET newsgroup service.

PING(ICMP:0)

Packet INternet Groper is a protocol that sends out ICMP echo

 

requests to test whether or not a remote host is reachable.

POP3(TCP:110)

Post Office Protocol version 3 lets a client computer get e-mail from a

 

POP3 server through a temporary connection (TCP/IP or other).

PPTP(TCP:1723)

Point-to-Point Tunneling Protocol enables secure transfer of data over

 

public networks. This is the control channel.

PPTP_TUNNEL(GRE:0)

Point-to-Point Tunneling Protocol enables secure transfer of data over

 

public networks. This is the data channel.

RCMD(TCP:512)

Remote Command Service.

 

 

REAL_AUDIO(TCP:7070)

A streaming audio service that enables real time sound over the web.

 

 

REXEC(TCP:514)

Remote Execution Daemon.

 

 

RLOGIN(TCP:513)

Remote Login.

 

 

RTELNET(TCP:107)

Remote Telnet.

 

 

RTSP(TCP/UDP:554)

The Real Time Streaming (media control) Protocol (RTSP) is a remote

 

control for multimedia on the Internet.

SFTP(TCP:115)

Simple File Transfer Protocol.

 

 

147

Chapter 11 Firewall Configuration